If your car only has 24,000 the tires have worn out prematurely possibly due to bad wheel alignment, under inflation and / or lack of rotation. (yourmechanic.com)
Bad wheel bearings causing a humming noise are not uncommon too. (samarins.com)
This experience was marred just a bit by bad wheel vibration, but other than that, I really like this car. (autoweek.com)